Process of manufacturing runner bricks



w. MALZACHER PROCESS OF MANUFACTURING RUNNER BRICKS Feb. 23 1926.

Original Filed Jan. 12, 1923 IN V E N TOR miher'Ma/lzacher Patented Feb. 23,

UNITED STATES PATENT OFFICE.

WALTHER MALZACHEB, OF TRAISEN, AUSTRIA.

PROCESS OF MANUFACTURING RUNNER BRICKS.

Original application filed January 12, 1923, Serial No. 612,362. Divided and this application filed October To all whom it may concern:

Be it known that I, VVALrr-rnn ftIALZAGI-IER, a citizen of the Republic ofSwitzerland, and a resident of 'lraisen, Lower Austria, Republic of Austria, have invented certain new and useful Improvements in Processes of Manufacturing Runner Bricks, of which the following is a specification.

In casting iron and more particularly steel, a permanent base plate is used on which the mould and stand pipe are mounted; the stand pipe reaches to a level above that of the mould tops, communication is established between the standpipe and the moulds by runner bricks provided with suitable passages namely main passages and branch passages, the main passages of each of the runner bricks communicating with the main passages of one or more adjacent runner bricksand the branch passages connecting the main passages of the bricks with the moulds tightly fitted onto the same. The runner bricks are located in suitable rooves orovided for this purpose in the permanent base plate tightly fitting each other and the grooves.

In casting molten metal is pouredinto the stand pipe and flows through the main and branch passages of the runner bricks to the several moulds mounted on the base plate. After the metal has set in the moulds and in the passages of the runner bricks, the latter and the moulds have to be removed, and fresh runner bricks have to be brought into position in the base plate preparatory to a fresh casting, while the runner bricks once used must be broken to recover the metal set in their passages.

The runner bricks heretofore used were made of fire brick or chamotte and thus were expensive and moreover theycould not be made at the foundry whenever required but had to be ordered from special fire brick works. V

In order to dispense with the runner bricks, base plates were proposed in which either the entire base plate or part thereof were so constructed that the walls of the channels therein can be formed of refractory material which is heated in the re quisite parts of the base plate, the requisite passages being produced therein. This, however, involves great expense as new base plates have to be substituted for those heretofore used.

Serial No. 741,652.

The object of my invention is, while retaining the usual or existing base plates, to substitute for the expensive-runner bricks, made of the fire clay or chamotte runner bricks which may be easily made in the foundry from materials there ready at hand, so that any foundry may at once use my improved runner bricks with the existing base plates' With this object in View my present invention consists in a process for manufacturing an improved runner brick which comprises a rigid frame preferably of cast steel or steel sheet of the shape of the usual runner bricks, made of fire bricks or chamotte and filled with some suitable refractory moulding material such as sand, loam or the like in which the required main and branch passages are formed in the usual way by cores.

hiy improved process consists in mounting cores for the passages in a rigid metal frame open at at least two faces, filling such frame with moulding material and removing the cores through the open faces of the frames.

Preferably sand moistened with sulfite lye in the usual way is used as moulding material, andis pressed into the frames. The end faces and the top face of the frame are open and its bottom may be provided with an opening.

This application is a division of my application filed January 12th, 1923, Serial No. 612,362.

In the annexed drawing-Fig. 1 is a perspective view of a constructional form of the rigid frame of my improved runner brick, Fig. 2 is a transverse section of the latter-and Fig. 3 is a'plan view of the base plate provided with my improved runner bricks and mould mounted thereon. Fig. l is a perspective View of modification of the rigid frame of my improved runner hi-al vided with an opening 4; is open at the top and end faces the"si"de walls may be provided on top with inwardly projecting flanges 12, 13. frame is filled with some suitable refractory moulding ma terial 5 such as sand preferably moistened with sulfite lye or with loan'iorth like. The usual main passages 6 and branch passages 7 are formed by means of cores in serted before filling and pressing in the moulding material a nd'the cores then removed as is well known in .making moulds. The opening -lin'the bottom face 3 serves for compressingthe moulding material within the frame but in may cases such compression is not necessary and then the opening a may be dispensed with.

The frame filled with moulding material with the main and branch passages 'p'ro'-. vided therein'is then preferably slightly heated if 'de'sired and is then brought into the base plate 8 the same as the fire brick or chamotte runner bricks heretofore in use as is indicated in lfli 3, where indieates the stand pipe and hi the casting moulds.

Instead of providing inwardly projecting flanges 12, 13 at the top sides of the side walls 1 and 2 I may" also make the side walls wedge shaped in transverse section tapering at the inside from top to the bottom or from top and bottom towards a line at about the middle of. the height of the mould as shown in Fig. 4. By this modified construction of the frame the same is strengthened and a more uniform compression of the moulding material is se; cured,

In m a s he unn bricks, more particularly those immediately below the stand pipe which are subject tothemolten metal us ng d wnward. h u h. h sta d pipe, must be reinforced. It is therefore advisable to providebelow the branch passage Tileading from thestandpipe to the main passage, a fire brick block 9 so as to form the bottom of the main passage 6as shown in Big. Inthis case the bottom wallB is preferably .providedn'ith inwardly projecting ribs 10 for preventing lateral displacement offthe iire brick block 9.

In order to dispense with the application of loam or other'plastic tightening materialto the'joints of the'runner bricks the same maybe provided at one end face of the filling material with a projection 11 and at" the opposite end face with a corresponding recess'14', but as a rule this is not required with my runner bricks as sufficiently tight joints are obtained with plain end faces by applying some plastic loam 9. the and fa es as u u l The improved runner bricks above described are placed in the base plate and after casting they are removed therefrom in the same way as the chamotte runner bricks heretofore used. After the improved runner bricks have been removed from the base plate the moulding material and the metal set in the passages thereof is removed from the frames. Both the frames and the moulding material may be used over and over a n.-

Thus all the foundry req 'lircs is a comparatively very small stock of the rigid frames made cast steel or sheet steel the moulding material preferably sand being at hanil: in the foundry and all the runner bricks required may be readily made from these materials at the foundry itself in the si npliest and cheapest manner, whereby a large saving is secured, and the foundry becomes independent of fire brick works furnishing the chamotte runner bricks heretofere used. Moreover if any change of the dimension and shape of the runner bricks is desirable for any reasons alltliat is required is to cast a small number of fresh frames, which may be done without any diiiiculty in the foundry itself. This also permits making and using frames representing a combination of a plurality of ch otte runner bricks'whercby the number of oints maybereduced when the runner brieks are placed in the base plates.

, Any suitable moulding material may be used, such assand, loam or the like according to existing conditions. Normally the improved, runner bricks are placed in the base plate with their open top face and the branch passages upwards, but whereas moulds are to be mounted on the runner bricks the latter are not provided with branch pa ssage's and may also be placed in the base p late with the bottom 'all upwards.

hat I claim is:

A process for manufacturing runner bricks consisting in mounting cores for the passages inarigid metal frame open at at least two faces, filling such frame with moulding material and removing the cores th-rough the open faces of the frames.

W T MALZACHER. 

